[cvs-nhc98] Missing #include <errno.h> for Cygwin

malcolm: Wed May 23 18:15:04 CEST 2001 Update of /usr/src/master/nhc/src/runtime/Builtin In directory hinken:/tmp/cvs-serv4066/src/runtime/Builtin Modified Files: cIOExtras.c Log Message: Missing #include for Cygwin